Tensional lock for adjusting-screws.



No. 770,194. PATENTED SEPT. 13, 1904, 0. F.- SPLITDORI.

TENSIONAL LOOK FOR ADJUSTING SGREWS.

APPLICATION FILED NOV.18. 1903. N0 MODEL.

ATTOR N EY.

UNITED STATES PATENT UEETCE.

CHARLES F. SPLITDORF, OF NEWV YORK, N. Y.

TENSIONAL LOCK FOR-ADdUSTlNG-SCREWS.

SPECIFICATION forming part of Letters Patent No. 770,194., datedSeptember 13, 1904.

Application fil d November 18,1903. Serial No. 181,688. (No model.)

To (bZZ/ whom, it puny concern.-

Be it known that I, CHARLES F. SPLTTDOEF, a citizen of the United Statesof America, and a resident of the borough of Manhattan, in the city,county, and State of New York, have invented certain new and usefulImprovements in Tensional Locks for Adjusting-Screws, of which thefollowing is a specification.

This invention relates to the adjusting-screw member forming a part ofthe interrupter mechanism of jump-spark coils; and my improvement refersparticularly to a novel means of setting or looking said screw memberwhen adjusted in a desired position in a simple and expeditious manner.

In brief my invention consists of a spring disposed about anadjusting-screw and located between the'head of the latter and thesurface of the bridge or support for the screw, said spring beingcontracted between said members and exerting sufficient force againstthe head of the adjusting-screw to prevent the latter from turningwithout the direct appli cation of considerable rotative force.

As will be obvious, the purpose of my in vention is to guard against theaccidental loosening of the adjusting-screw, while at the same time saidmember remains susceptible to adjustment by a strongly-applied manualturning movement.

In the drawings accompanying this application I have included theimprovement in intorrupters forming the subject of a concurrentapplication for patent; but I do not wish to limit my tensional lock foradjusting-screws to use in such combination, being aware that it isequally applicable for use with jumpspark coils employing other forms ofvibrator mechanism.

In the drawings accompanying this application, Figure l is a partialside elevation of a coil having the vibrator and adjusting mechanism,partly in section. Fig. 2 is a plan view of a bridge or mount supportingan adjustingscrew having a modified form of tensional lock, and Fig. 3is an end view of Fig. 2.

In said figures, A indicates the core of a jump-spark coil; B, thevibrator-mount, having projection b, forming a fulcrum for the vibrator;C, the vibrator-spring, secured at one end to said mount, as at 0; D,the armature, secured at the opposite end of the vibrator, and E theusual contact carried on the vibrator and adapted to be moved thereby.Opposed to said contact E is the usual fixed contact F, carried by theadjusting-screw G, which latter has the knurled head 0 and is supportedwithin the threaded mount or bridge H.

Placed about the screw G is a helical spring I, the latter beingcontracted and exerting tension between the screw-head r and the surfaceof the mount or bridge H and having sufficient force to frictionallyunite the thread of screw Gr against the thread in the mount H, so thatsaid screw will not be liable to turn or move from its set positionthrough vibration or without the application of an unusual degree ofturning force. Against a spring such as used by me to this end theadjustingscrew can be conveniently turned by hand, although morestrength must be applied than is required to turn the screws hithertoused having secondary means of locking or setting; but I have found agood stout spring, such as will retard but not prevent the turning ofthe screw by hand, answers very satisfactorily as a lock to prevent thescrew from losing its set position due to vibratory action.

In Figs. 2 and 3 I have shown a form of flat spring, as J, which I mayuse instead of the helical spring described. Tongues, as f], extend fromthe spring ends and enter grooves, as 71/ h, formed in the bridge H,acting as guides for the spring in its contraction and relaxation. Thetensional support afforded the screw G through spring I or J imparts adegree of elasticity to said screw and gives it the character of atensional cushion, through impact with which the vibratory action of thespring 0 is improved, or any other convenient and practical form ofspring located between the screw-head and bridge or mount may beemployed without departing from the essence of my invention.

Having now described my invention, I declare that what I claim is- 1.The combination in a jump-spark coil, of an adjusting-screw having ahead, and carrying a contact-point, a threaded support for sald screw,and a sprmg lnterposed between tween, and bearing tensionally against,said said head and support to tensionally retard screw-head and support.10 the turning" of said screw. Signed at New York this 16th day of No-2. The combination in a jump-spark coil, of vernber, 1903.

-' l 5 an adjusting-screw having a head and carry- CHARLES F. SPLITDORF.

ing a contact-point, a threaded support for Witnesses:

said screw, and a helical spring placed about F. WV. BARKER,

said screw, said spring being contracted be- 1 NAT B. CHADsEY.

